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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Jun. 30, 2015
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Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 821,675 | $ 827,337
Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 77,192 | 98,360
Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 744,483 | 728,977
Corporate Fixed Income Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 395,102 | 391,275
Corporate Fixed Income Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 395,102 | 391,275
Value Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 68,731 | 102,466
Value Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 68,731 | 102,466
Growth Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 38,126 | 54,179
Growth Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 38,126 | 54,179
Balanced Funds [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 8,581 | 10,090
Balanced Funds [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 8,581 | 10,090
Common Stock [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 74,163 | 94,964
Common Stock [Member] | Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 74,163 | 94,964
US Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 79,275 | 68,628
US Government Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 79,275 | 68,628
Foreign Government Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 43,729 | 44,474
Foreign Government Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 43,729 | 44,474
Other Fixed Income Securities [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 31,503 | 32,540
Other Fixed Income Securities [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 31,503 | 32,540
Other [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 82,465 | 28,721
Other [Member] | Level 1 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 3,029 | 3,396
Other [Member] | Level 2 [Member] |  |
Benefit Plan Assets Classified Under Appropriate Level of Fair Value Hierarchy [Abstract] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 79,436 | $ 25,325

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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